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5 prong relay 87A

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Old 05-26-2010, 03:21 PM   #1
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5 prong relay 87A

Okay so i got a relay hooked up on a buddies truck. The relay is clicking when it gets power from the pressure switch but the comp won't turn on.

I only have the 87 prong hooked to the compressor, do i ground out the 87A prong or wire it into the positive side of the compressor also?

All my grounds are good as the compressor and relay ground are at the same screw, and the relay is clicking.
Old 05-26-2010, 03:25 PM   #2
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Re: 5 prong relay 87A

Old 05-26-2010, 03:53 PM   #3
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Re: 5 prong relay 87A

87A gets left alone. it is a positive out put. so do not ground it. and if you hook it to the comp, it will run continuous. you have something else wrong. double check all your wires.
Old 05-26-2010, 04:09 PM   #4
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Re: 5 prong relay 87A

^ that is a 4 prong relay.


Quote: Originally Posted by IRSd_mini
87A gets left alone. it is a positive out put. so do not ground it. and if you hook it to the comp, it will run continuous. you have something else wrong. double check all your wires.
Thanks Larry, guess ill be breaking out the ol test bulb
Old 05-26-2010, 06:19 PM   #5
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Re: 5 prong relay 87A

5 prong relay works the same as 4 prong with the exception being 87a for a NO/NC thing...I typically only use the 87a prong on polarity switching items such as door lock actuators.
Old 05-26-2010, 06:52 PM   #6
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Re: 5 prong relay 87A

Quote: Originally Posted by IRSd_mini
87A gets left alone. it is a positive out put. so do not ground it. and if you hook it to the comp, it will run continuous. you have something else wrong. double check all your wires.

its a whatever is on 87 Normally Open output. so when the relay is not energized, 87 is connected to 87a. when the relay is energized, 87 is connected to 30.

long time no see larry, its russ d. glad you are still around!
Old 05-26-2010, 06:52 PM   #7
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Re: 5 prong relay 87A

Yeah just ignore the 87a and run it like the diagram above.
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